NBN EN ISO 7490 : 2001

Contents
Foreword
Introduction
1 Scope
2 Term and definition
3 Classification
4 Requirements
4.1 Appearance of powder
4.2 Fluidity at working time
4.3 Setting time
4.4 Compressive strength
4.5 Linear setting expansion
4.6 Linear thermal expansion
5 Sampling, test conditions and mixing
5.1 Sampling
5.2 Test conditions
5.3 Mixing
6 Test methods
6.1 Visual examination
6.2 Fluidity at work time
6.3 Setting time
6.4 Compressive strength
6.5 Linear setting expansion
6.6 Linear thermal expansion
7 Manufacturer's instructions
8 Packaging
8.1 Packaging
8.2 Mould lining
9 Marking

Specifies requirements for, and establishes a classification of, gypsum-bonded casting investments together with the test methods to be used to determine compliance with these requirements. Applies to gypsum-bonded investments suitable for casting dental gold alloy which have liquid temperatures not greater than 1080 Degrees C. Coverage includes: sampling, packaging and marking. Also includes annexes, tables and diagrams.